They all work on the same principle : washing clothes in soapless warm water does have some cleansing effect , particularly for nongreasy garments mainly soiled by dust , dirt and sweat 它們的作用方式全都相同:可在不含肥皂的溫水中達(dá)到部份清潔效果,尤其對(duì)非油污、主要因灰塵、泥土與汗水而弄臟的衣物特別有效。